mvc4 url validation

Question

I\'m writing this question here after trying to find an answer for two days.

basically here\'s what\'s going on.

I have a property in the viewmodel as follow

Answer 1

You can do this using the DataAnnotationsExtensions library. They have an UrlAttribute that you can configure to only validate when a protocol is specified. This attribute also supplies client-side validation. You can see an example of this behavior here: http://dataannotationsextensions.org/Url/Create

You can use this attribute as follows:

using System.ComponentModel.DataAnnotations;

namespace DataAnnotationsExtensions.Core
{
    public class UrlEntity
    {
        [Url]
        [Required]
        public string Url { get; set; }

        [Url(UrlOptions.OptionalProtocol)]
        [Required]
        public string UrlWithoutProtocolRequired { get; set; }

        [Url(UrlOptions.DisallowProtocol)]
        [Required]
        public string UrlDisallowProtocol { get; set; }
    }
}

For your purposes, the first option suffices.

The package of this library (with ASP.NET MVC support included) can be found on NuGet: Install-Package DataAnnotationsExtensions.MVC3

Note: this also works fine with ASP.NET MVC 4

Answer 2

Not sure if I fully understand the question. Are you trying to validate for correctly formed URLs? If so you could implement a RegularExpression DataAnnotation as follows:

[RegularExpression(@"^http(s?)\:\/\/[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*(:(0-9)*)*(\/?)([a-zA-Z0-9\-\.\?\,\'\/\\\+&%\$#_]*)?$", ErrorMessage = "My Error Message")]